| Bill & BEN Books Ltd | Wholesale & retail | 2020 |
| Birdstone Limited | Agriculture & fishing | 1977 |
| Blue Sky Ski-Ing Limited | Wholesale & retail | 2020 |
| BMR Farming Limited | Agriculture & fishing | 1982 |
| Bofin Farmers Ltd | Professional & scientific | 2022 |
| Bofin Research CIC | Professional & scientific | 2025 |
| BOO Radley Limited | Professional & scientific | 2024 |
| Bottle Topped Ltd | Wholesale & retail | 2020 |
| Bowes House Management Limited | Households | 1995 |
| Bray Group Limited | Manufacturing | 1978 |
| Brennan's Gym Limited | Arts & recreation | 2019 |
| Bring the Game Over Limited | Arts & recreation | 2017 |
| BRM Plant Hire & Sales UK Ltd | Construction | 2022 |
| BRM Property Services Ltd | Construction | 2023 |
| BRM Real Estate UK Ltd | Real estate | 2022 |
| Brothers Yard Ltd | Real estate | 2024 |
| BS Support Limited | Administrative & support | 2018 |
| Buds Limited | Education | 2003 |
| Burnout BBQ Ltd | Hospitality | 2018 |
| Butler and Duke Ltd. | Construction | 2016 |
| Butlers CT Lechlade Limited | Extraterritorial | 2026 |
| Bydand PM Limited | Professional & scientific | 2012 |
| C&H Management Ltd | Information & communication | 2019 |
| C.D. & R.D. Investments Limited | Construction | 2003 |
| C.Sollis Transport and Logistics 1808 Ltd | Transport & logistics | 2025 |
| Cake Positive Limited | Financial services | 2011 |
| Caldecourt Holdings Limited | Financial services | 2023 |
| Call-On Plumbing & Heating Ltd | Construction | 2020 |
| Call-On Properties Ltd | Households | 2023 |
| Callahan Property Limited | Real estate | 2021 |
| Calyd Candles Ltd | Manufacturing | 2026 |
| Cambrian Learning Trust | Education | 2012 |
| Canasta LLP | | 2013 |
| Canvas Community Interest Company | Information & communication | 2019 |
| CAP CAP Limited | Professional & scientific | 2012 |
| Carbon Construction Ltd | Construction | 2012 |
| Carriageway Vehicle Solutions Ltd. | Wholesale & retail | 2013 |
| Carter & Mcarthur Limited | Manufacturing | 2012 |
| Cat Construction UK Limited | Construction | 2007 |
| Cbam Management Ltd | Professional & scientific | 2015 |
| Cbgroundworks & Civil Engineering Ltd | Construction | 2020 |
| CBS Facilities Ltd | Other services | 2025 |
| Cedar Professional Services Limited | Professional & scientific | 2002 |
| CER Holdings Limited | Financial services | 2023 |
| Cerebral Healthcare Limited | Health & social care | 2020 |
| Cgpc Financial Limited | Professional & scientific | 2020 |
| Chacrica Projects Ltd | Professional & scientific | 2026 |
| Chadwicks Plumbing Ltd | Construction | 2020 |
| Charis Care Ltd | Health & social care | 2018 |
| Charles Brady Limited | Administrative & support | 2022 |
| Charney Pet Care Ltd | Other services | 2026 |
| Chesterton Pembroke Consulting Limited | Professional & scientific | 2012 |
| Chicabrava Limited | Hospitality | 2026 |
| Chimera Digital Limited | Administrative & support | 2017 |
| Chris Lewis Electrical Limited | Construction | 2021 |
| Christ Army Charismatic Ministries | Other services | 2006 |
| Chyngton Land Limited | Real estate | 2015 |
| Citrus Photography Ltd | Professional & scientific | 2019 |
| Classic Waterbeds (UK) Limited | | 1985 |
| Clausewatch Ltd | Information & communication | 2025 |
| Clean Scene BIO Ltd | Administrative & support | 2025 |
| CLEAR2RUN Limited | Professional & scientific | 2011 |
| Clerical Code Limited | Extraterritorial | 2023 |
| Clever Badger Properties Ltd | Real estate | 2025 |
| Clifford Power Generation Ltd | Professional & scientific | 2008 |
| Clifton House (Swindon) RTM Company Limited | Real estate | 2009 |
| Clive Morley Harps Limited | Wholesale & retail | 1988 |
| Clover Cottage Productions Ltd | Information & communication | 2021 |
| Clubbing the Bard Limited | Arts & recreation | 2023 |
| CM Professional Services Limited | Professional & scientific | 2024 |
| Coldharbour Grazing Limited | Agriculture & fishing | 2019 |
| Combes Close Management Limited | Administrative & support | 2025 |
| Compton Beauchamp Estates Limited | Agriculture & fishing | 1999 |
| Concrete MAN Ltd | Manufacturing | 2019 |
| Contractor Accounting Limited | Professional & scientific | 2013 |
| Coombs Carpentry Limited | Construction | 2023 |
| Cotswold Conditioning Limited | Arts & recreation | 2021 |
| Cotswold Wild Ones Limited | Wholesale & retail | 2022 |
| Cotswold Woodworking Limited | Manufacturing | 2022 |
| Cowleaze Holdings Ltd | Financial services | 2021 |
| Cowleaze Project Management Ltd | Professional & scientific | 2021 |
| COX Electrical Solutions Ltd | Construction | 2025 |
| Coxwell Property Ltd | Hospitality | 2024 |
| Craft Waffle Limited | Hospitality | 2017 |
| Creativity Reserve Ltd | Extraterritorial | 2021 |
| Creekon Limited | Transport & logistics | 2020 |
| Crowood Industries Ltd | Professional & scientific | 2010 |
| Crystal Diamond Tech Ltd | Manufacturing | 2024 |
| Curtis Building Services Limited | Other services | 2022 |
| Cyclomania Ltd | Arts & recreation | 2018 |
| D J Phillips Heating Limited | Construction | 2009 |
| Dairy Barn Consulting Limited | Professional & scientific | 2017 |
| Danes Consultants Ltd | Professional & scientific | 2019 |
| DAP Pro Services Ltd | Administrative & support | 2022 |
| Dashwitness Ltd | Manufacturing | 2014 |
| Dataout Ltd | Construction | 2025 |
| David Leigh-Pemberton Limited | Professional & scientific | 2010 |
| Davies & Davies Associates Limited | Professional & scientific | 2008 |
| Day Day Tour Travel Consultant Ltd | Wholesale & retail | 2025 |
| DB2 Software Ltd | Information & communication | 2020 |